Growing Cosmos in Zone 10
When to plant and harvest cosmos in Zone 10— based on your zone's frost dates.
Zone 10 sits comfortably within cosmos' best range (Zones 2–11), so it grows well here on a standard schedule.
Cosmos planting calendar for Zone 10
These months are derived from Zone 10's frost dates — last frost around Rare or none, first frost around Rare — December to January in coldest years.
Start indoors
—
Sow outdoors
February
Transplant
—
Harvest
—
Cosmos care at a glance
- Sunlight
- Full sun (6+ hours)
- Water
- Low — drought-tolerant once established
- Spacing
- 12–18 in apart
- Days to maturity
- 50–90 days to first bloom
- Best zones
- 2–11 (warm-season annual)
Growing cosmos in Zone 10: FAQs
Can you grow cosmos in Zone 10?＋
Zone 10 sits comfortably within cosmos' best range (Zones 2–11), so it grows well here on a standard schedule.
When should I plant cosmos in Zone 10?＋
In Zone 10, sow outdoors around February. Zone 10's last spring frost is typically Rare or none and its first fall frost around Rare — December to January in coldest years, which sets the planting window.
When to harvest cosmos in Zone 10?＋
Harvest timing depends on your planting date and variety — cosmos typically matures in 50–90 days to first bloom. See the full guide for harvest cues.
Full Cosmos guide →
Complete care, problems, companions, and harvest tips.
Zone 10 overview →
Frost dates, climate, and everything to grow here.
June in Zone 10 →
What to sow, transplant, and harvest this month.